[Sanitizer] Add 'dispatch' feature to be used in compiler-rt tests

compiler-rt/CMakeLists.txt

 # COMPILER_RT_DEBUG_PYBOOL is used by lit.common.configured.in.
 pythonize_bool(COMPILER_RT_DEBUG)
 
 option(COMPILER_RT_INTERCEPT_LIBDISPATCH
   "Support interception of libdispatch (GCD). Requires '-fblocks'." OFF)
 if (APPLE) # Always enable on Apple platforms.
   set(COMPILER_RT_INTERCEPT_LIBDISPATCH ON)
 endif()
+pythonize_bool(COMPILER_RT_INTERCEPT_LIBDISPATCH)
 
 if(APPLE AND SANITIZER_MIN_OSX_VERSION AND SANITIZER_MIN_OSX_VERSION VERSION_LESS "10.9")
   # Mac OS X prior to 10.9 had problems with exporting symbols from
   # libc++/libc++abi.
   set(cxxabi_supported OFF)
 else()
   set(cxxabi_supported ON)
 endif()

compiler-rt/test/lit.common.cfg

if target_arch:
   if target_arch in ['x86_64', 'i386']:
     config.available_features.add('x86-target-arch')
   config.available_features.add(target_arch + '-' + config.host_os.lower())
 
 compiler_rt_debug = getattr(config, 'compiler_rt_debug', False)
 if not compiler_rt_debug:
   config.available_features.add('compiler-rt-optimized')
 
+dispatch = getattr(config, 'compiler_rt_intercept_libdispatch')
+if dispatch:
+  config.available_features.add('dispatch')
+
 sanitizer_can_use_cxxabi = getattr(config, 'sanitizer_can_use_cxxabi', True)
 if sanitizer_can_use_cxxabi:
   config.available_features.add('cxxabi')
 
 if config.has_lld:
   config.available_features.add('lld-available')
 
 if config.use_lld:

compiler-rt/test/lit.common.configured.in

 set_default("enable_per_target_runtime_dir", @LLVM_ENABLE_PER_TARGET_RUNTIME_DIR_PYBOOL@)
 set_default("llvm_tools_dir", "@LLVM_TOOLS_DIR@")
 set_default("llvm_shlib_dir", "@LLVM_LIBRARY_OUTPUT_INTDIR@")
 set_default("gold_executable", "@GOLD_EXECUTABLE@")
 set_default("clang", "@COMPILER_RT_RESOLVED_TEST_COMPILER@")
 set_default("compiler_id", "@COMPILER_RT_TEST_COMPILER_ID@")
 set_default("python_executable", "@PYTHON_EXECUTABLE@")
 set_default("compiler_rt_debug", @COMPILER_RT_DEBUG_PYBOOL@)
+set_default("compiler_rt_intercept_libdispatch", @COMPILER_RT_INTERCEPT_LIBDISPATCH_PYBOOL@)
 set_default("compiler_rt_libdir", "@COMPILER_RT_RESOLVED_LIBRARY_OUTPUT_DIR@")
 set_default("emulator", "@COMPILER_RT_EMULATOR@")
 set_default("asan_shadow_scale", "@COMPILER_RT_ASAN_SHADOW_SCALE@")
 set_default("apple_platform", "osx")
 set_default("sanitizer_can_use_cxxabi", @SANITIZER_CAN_USE_CXXABI_PYBOOL@)
 set_default("has_lld", @COMPILER_RT_HAS_LLD_PYBOOL@)
 set_default("can_symbolize", @CAN_SYMBOLIZE@)
 set_default("use_lld", False)

llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn

values = [
     "LLVM_LIBRARY_OUTPUT_INTDIR=" + rebase_path("$root_build_dir/lib"),
 
     "GOLD_EXECUTABLE=ld",
     "COMPILER_RT_RESOLVED_TEST_COMPILER=" +
         rebase_path("$root_build_dir/bin/clang"),
     "COMPILER_RT_TEST_COMPILER_ID=Clang",
     "PYTHON_EXECUTABLE=$python_path",
     "COMPILER_RT_DEBUG_PYBOOL=False",
+    "COMPILER_RT_INTERCEPT_LIBDISPATCH_PYBOOL=False",
     "COMPILER_RT_RESOLVED_LIBRARY_OUTPUT_DIR=" +
         rebase_path(crt_current_out_dir),
     "COMPILER_RT_EMULATOR=",
     "COMPILER_RT_ASAN_SHADOW_SCALE=",
     "SANITIZER_CAN_USE_CXXABI_PYBOOL=True",
     "COMPILER_RT_HAS_LLD_PYBOOL=True",
     "HAVE_RPC_XDR_H=0",
     "ANDROID_NDK_VERSION=19",